It takes up to three hours for the droplets to settle out of the air. Where do you think the droplets are, if not in the air?
It's in the air immediately surrounding the place where they were expelled or deposited by the sick person. It's not freely floating in the breeze coming through your window from miles away. This is why public health officials don't recommend everyone wear masks all the time, but do recommend everyone constantly wash their hands and social distance.
FAQ: Methods of Disease Transmission
Coronavirus Disease 2019 (COVID-19) - Transmission